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Engine overheating problems

Overheating and pasted rust under engine coolant cap

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Run a can or two of coolant system cleaner through your system and flush

Posted on May 09, 2014

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Overheating


Overheating can be "boiled" down to a few issues:
*blockage: Something is stopping or slowing the flow. Main suspect is the thermostat. It is designed to open and close at the proper temperature so as to keep the engine at the optimum temperature range. They have a tendency to lock closed and cause overheating. Sometimes it's random. The blockage may be something like sludge or rust in the radiator or gunk that someone put in that does not agree with it.

*coolant/water loss. A leak somewhere. Blown head gasket, cracked head/block, hose, etc.
*pressure loss. This happens when the water gets to boiling temperature but is kept under control by pressure (pressure resists heat) and then something such as the radiator cap releases the pressure and the temperature rises. The coolant will also leak out and then the overheating will be due coolant loss as well. This is especially true with the Cadillac Northstar. The head bolts allow the head to lift off the block, ever so slightly, and pressurize the coolant system with exhaust gases beyond radiator cap pressure limits. It's usually when you accelerate or put the engine under load such as going up hill.

^check for exhaust gases in the coolant. smell it or buy a kit to test.
^get a new thermostat, or, test the old one by boiling it in water on the stove; see if it opens. I always get the "failsafe" kind: fails in the open position.
^check for oil in the coolant or coolant in the oil: grey sludge.
^check for leaks on the ground.
^test the radiator cap. some part stores have a way to test them.
^check to see if it's made by Cadillac. look for the word Northstar. If so, hold on to your wallet. There's a whole new world of overheating adventures.

Oct 27, 2013 | 2001 Oldsmobile Alero

1 Answer

2002 pontiac grand prix center council get hot when the car is idling


Start by checking your coolant level-both the radiator (when it's cooled enough to remove the cap) and the overflow tank. The radiator should be full with clean-looking coolant, and the overflow tank should be about half full (it has a cold mark and a hot mark on it). If the coolant is correct and not leaking or losing fluid, then check your cap for a good seal-the coolant is pressurized when car is running, and an old cap can leak pressure. Do your radiator fans cycle normally? They should come on when your coolant reaches a set temperature. Also, is your coolant more than two years old? If it is, I'd change it and consider having the radiator and engine flushed to remove any build-up of sediment or rust, scale, debris. Which would also be a good time for a new thermostat-cheap and necessary maintenance items. As for possible worn parts or needed repairs-well, your water pump might be something to keep in mind if the above mentioned checks don't stop the overheating. Hope you get it fixed soon before it gets worse-overheating is very bad on these aluminum head engines.

Oct 09, 2011 | 2002 Pontiac Grand Prix

1 Answer

3 months ago i changed to a new radiator after going trough water bottle after water bottle.Things were fine.Now im over heating again with the problem being the pressure cap of the water bottle apparently...


There is no water bottle

All vehicles have a coolant recovery container

When the vehicle warms up ,some coolant goes
past the radiator cap into it

At night when cool, the radiator draws back what
it needs

Been that way for 50 years

That container isn't under pressure as you can see

You have to diagnose the engine overheating issue

You have a new radiator,I would assume new thermostat
& rad cap,so continue on

It is very old, so a head gasket wouldn't be a supprise

Aug 02, 2011 | 1990 Jeep Cherokee Limited

2 Answers

After a long drive the overflow tank for the radiator leaked out a bunch of thick rust colored goop. Engine didn't show it was running hot though. I did have a problem with the heat this past winter,...


The thick rust stuff is your coolant. And a load of dissolved cooling system.

I think you'll find that after a long run, your engine overheated slightly, coolant expanded and had to go somewhere.

Your thermostat could do with a good look at, maybe also the water pump, perhaps changing (It is 10 years old now) and if its all a mucky brown, your coolant isn't doing its job properly, could do with renewing.

May 31, 2011 | 2001 Ford Taurus

3 Answers

Can a worn out coolant cap cause overheating


There is no radiator cap on the Northstar engine.
The only cap is on the surge tank (or expansion tank) and is pressurized.

So the answer is Yes, a faulty surge tank cap will result in the loss of coolant and therefore lead to overheating.

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Jul 05, 2010 | 1998 Cadillac DeVille

1 Answer

What cause engine overheating


Several problems can cause it. A thermostat that is stuck closed (will not allow coolant to circulate- remove and place in a pan of boiling water, it should open rather quickly). Engine cooling fan(s) not operating as temp rises (when temp gauge goes up past normal range, check to see if fan is running. If not, it could be a switch that controls the fan operation, or less possible, a bad fan motor). A radiator plugged up with rust and sediment won't allow proper circulation of coolant, resulting in overheating. If coolant has not been changed in a long time, or appears rusty, flush the system thoroughly. You may need to have the radiator professionally flushed if it's plugged up bad. Good luck!

Apr 20, 2010 | 1995 Mitsubishi Galant

1 Answer

I have 97 4runner sr5 (not 4wd) it has 244K miles on it - i took it in for an oil change and i was told that it is recommended that i get an "enging flush" and also a "radiator flush". I just checked out...


The only engines I have ever seen that needed to be "flushed" were engines that had used Quaker State oil for a long time. Usually about the only good way to tell is your engine is gummed up is to remove the oil pan of the intake manifold and see how much residue is built up in the engine. If your radiator has rust in it and the cap & gasget have rust deposits on them and or the overflow resivoir tank has rust in it thenn I would say to drain and flush the coolant system. If there is no rust, the coolant is the orinigal coolant color and the engine is not overheating it does not need to be flushed. Follow the reccomendations of the coolant manufacturer as far as to the length of use before draining and replacing with fresh coolant.

Feb 16, 2010 | 1998 Toyota 4Runner

3 Answers

Overheating fto


make sure you have 50/50 antifreeze and coolant.if its been awhile replace radiator pressure cap and thermostat.

Jul 25, 2009 | 1993 Toyota Camry V6

1 Answer

Jeep Cherokee 2.5td overheating


AIR IN COOLING SYSTEM. NEED TO FLUSH COOLANT AND RUST OUT OF SYSTEM AND INSTALL NEW COOLANT WITH A NEW CAP

Mar 22, 2009 | 2001 Jeep Cherokee

2 Answers

Overheating and rust on B-pillars


the overheating could be due to head gasket/cylinder head failure. you should examine the coolant reservoir for oil contaimination & have a look at the engine oil.

Apr 23, 2017 | 2004 Mazda Protege

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